EP3630335B1 - Milieu filtrant, son procédé de fabrication et son utilisation dans un élément filtrant - Google Patents

Milieu filtrant, son procédé de fabrication et son utilisation dans un élément filtrant Download PDF

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Publication number
EP3630335B1
EP3630335B1 EP18727764.5A EP18727764A EP3630335B1 EP 3630335 B1 EP3630335 B1 EP 3630335B1 EP 18727764 A EP18727764 A EP 18727764A EP 3630335 B1 EP3630335 B1 EP 3630335B1
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EP
European Patent Office
Prior art keywords
filter medium
filter
layer
card web
filter paper
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EP18727764.5A
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German (de)
English (en)
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EP3630335A1 (fr
Inventor
Ivanka Poljak
Till Batt
Steffen Pfannkuch
Thilo Müller
Anja Koronai
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Mann and Hummel GmbH
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Mann and Hummel GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/522—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with specific folds, e.g. having different lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B32B37/1292—Application of adhesive selectively, e.g. in stripes, in patterns
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0216—Bicomponent or multicomponent fibres
    • B01D2239/0233—Island-in-sea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0457—Specific fire retardant or heat resistant properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0464—Impregnants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0618—Non-woven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0681—The layers being joined by gluing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1258—Permeability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/60—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the intake of internal combustion engines or turbines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1215—Hot-melt adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate

Definitions

  • the invention relates to a filter medium according to the preamble of claim 1, and a use of this filter medium.
  • filter paper The standard on the market today is predominantly filter media based on cellulose fiber, hereinafter referred to as filter paper. Compared to these media, the use of a filter medium in the sense of the invention offers a significant improvement in performance.
  • the WO 2008 078 858 A1 discloses a two- or multi-layer filter medium for filtering an air flow with a spunbond layer which is arranged on the upstream side of a paper layer. However, this does not offer sufficient performance improvement compared to filter paper.
  • EP1050331A1 discloses a two- or multi-layer filter medium for filtering an air flow with a melt-blown layer which is arranged on the upstream side of a filter paper layer.
  • the object of the present invention based on the aforementioned prior art, is to provide a filter medium in which separated dust is evenly distributed on the filter layer and a good separation efficiency is achieved with good air permeability.
  • a filter medium according to the invention comprises a carded fleece layer and a filter paper layer arranged downstream of it as an adjacent filter layer, the carded fleece layer having a higher air permeability than the filter paper layer.
  • the carded fleece layer is preferably less compressed than the filter paper layer or a spunbond layer. The dust absorption capacity of the filter medium is therefore increased and the pressure loss when the gaseous medium to be filtered, e.g. air, flows through the filter medium is reduced.
  • the dust separated in the open-pored carded fleece layer can be distributed particularly evenly.
  • This deep filtration enables a higher dust absorption capacity of the filter medium to be achieved with a comparable separation efficiency (in the sense of ISO 5011 in the version at the time of the first application of the present invention) compared to conventional, single-layer filter papers and compared to combined conventional filter media consisting of a single-layer filter paper and a single-layer spunbond (meltblown or spunbond).
  • the air permeability of a filter medium according to the invention is greater than that of a single-layer paper filter medium with a comparable separation efficiency.
  • the air permeability of the carded fleece layer measured according to DIN EN ISO 9237 at a differential pressure of 200 Pa, is more than 800 l/m 2 /s.
  • the air permeability of the carded fleece layer according to the above-mentioned measuring conditions is 1600 to 6000 l/m 2 /s.
  • the filter paper layer can advantageously have an air permeability of less than 800 l/m 2 /s according to the above-mentioned measuring conditions.
  • the fibers of the carded fleece layer have an average fiber fineness (as defined by ISO 1144 or DIN 60905, in the version valid at the time of the first application of the present invention) in the range of 1 to 30 decitex. This preferred fiber fineness enables particularly effective particle separation from a gaseous medium while at the same time providing good mechanical properties of the carded fleece layer.
  • the carded nonwoven fabric can comprise a mixture of at least two types of fiber with different fiber fineness.
  • the carded nonwoven fabric layer has a fine fiber content of at least 10% by mass, consisting of fibers with a fineness of 0.7 - 4 decitex, and a coarse fiber content of at least 10% by mass, consisting of fibers with a fineness of 3 - 10 decitex.
  • this advantageous composition of the carded fleece offers particularly effective particle separation from a gaseous Fluid with simultaneous good mechanical properties of the carded fleece layer.
  • the use of a carded fleece has the advantage that, in comparison to a meltblown, for example, fiber mixtures of fibers of different thicknesses can be used with a carded fleece without any additional processing effort.
  • the average basis weight of the carded fleece layer is from 10 to 120 g/m 2 , particularly preferably 35 to 100 g/m 2 .
  • the combination of the aforementioned fiber fineness and the basis weight describes an optimized relationship between filtration performance and sufficient permeability of the filter material. This allows high dust absorption capacities of the filter medium according to the invention with high air permeability at the same time.
  • a corresponding basis weight determination can be carried out according to DIN EN ISO 9237, in the version at the time of the first application of the present invention.
  • the packing density is understood to mean the volume-related solid content of the filter medium.
  • the carded fleece layer used has a packing density of between 1 and 10%, preferably in the range of 2 to 7%.
  • the filter paper layer can preferably be a wet-laid cellulose fiber layer.
  • the cellulose fiber layer can contain up to 30 percent by mass of synthetic fibers.
  • the filter paper layer enables fine filtration and also gives the filter medium an advantageously high mechanical rigidity.
  • Impregnation can prevent the fibers from detaching from the filter paper layer and ensures that the material is well resistant to water and other liquid contact substances.
  • the packing density of the impregnated filter paper layer is preferably greater than 10% and less than 30%. This also achieves the desired resistance to water (water resistance) and at the same time sufficient rigidity and processability on rotary folding machines.
  • Water resistance in the sense of this application is measured by the water absorption capacity in accordance with DIN EN ISO 535 in the version at the time of the first application of the present invention, whereby water-resistant in the sense of this application means a water absorption capacity in accordance with Cobb60 of DIN EN ISO 535 of less than 20 g/m 2 at 20 °C and standard pressure.
  • the filter medium according to the invention can advantageously have flame-retardant properties. This further increases the safety when using the filter medium in a number of applications.
  • the filter paper layer can advantageously have a flame-retardant impregnation.
  • the flame retardant provided or contained can be a phosphorus-based flame retardant.
  • the concentration and type of flame retardant should preferably be selected such that the filter paper layer (3) has flame-retardant properties according to flame retardancy class F1 according to DIN 53 438 - 3), in the version at the time of the first application of the present invention.
  • the fibers in the carded fleece layer contain polyester.
  • These can be either polyester fibers or polyester copolymer fibers. These materials are advantageous because they are particularly temperature-resistant.
  • the polyester copolymer fibers can in particular have a core-sheath structure, e.g. with conventional polyester materials as the core, which are surrounded by a sheath made of polyester copolymer. Mechanical and thermal bonding methods such as needling and thermofusion can be used to produce the carded fleece layer.
  • the fibers of the carded fleece layer in particular the polyester-containing fibers, can advantageously be mechanically bonded to one another, e.g. under the influence of pressure and/or thermally. This can advantageously be done by lamination of the layers, preferably under the influence of pressure and temperature, in particular by thermal/pressure calendering. Another preferred embodiment for the alternative or additional connection of both layers is ultrasonic welding.
  • both filter layers i.e. the carded fleece layer and the filter paper layer
  • both filter layers can also be glued together.
  • the connection is then advantageously made using an adhesive middle layer; for example, suitable adhesive layers are hot melt adhesives or reactive polyurethane adhesives.
  • the invention also includes a filter element with a folded filter medium according to the invention according to one of claims 1 to 8.
  • the filter medium is foldable and can therefore be further processed into a bellows.
  • the folds of the filter element, in particular the bellows, have fold spacings of more than 3.5 mm, in particular 4 to 8 mm.
  • the pleat height of the filter medium is between 10 and 60 mm.
  • the pleat spacing of a bellows made of conventional filter paper is usually 3.5 mm or less.
  • the folds of the filter medium can have front edges. These are arranged at the end of the folds.
  • the carded fleece layer and paper layer can be connected when making the filter bellows.
  • the glue/adhesive layer applied to seal the front edges in common filter elements can be used for this purpose.
  • the filter paper layer can also be connected to the carded fleece layer during the production of the bellows.
  • the adhesive tracks or adhesive beads provided for sealing and stabilizing the bellows can be used to advantage. These are applied to one of the two filter layers before the folds are set up.
  • the use of the filter medium according to the invention according to one of claims 1 to 8 and/or the filter element according to the invention according to claim 9 or 10 relates to the filtration of the intake air before it is introduced into an internal combustion engine.
  • a filter element made of the filter medium according to the invention additionally has an advantageous smaller filter surface than a conventional element made of filter paper, When used in air filtration, it shows better performance data than the conventional filter paper element, especially in tests according to ISO 5011.
  • Fig. 1 and 2 shows an embodiment of a filter medium 1 according to the invention with a nonwoven layer made of synthetic fibers arranged on the upstream side, which is designed in the form of a carded nonwoven layer 2 and a filter paper layer 3 arranged on the downstream side, for example an impregnated filter paper layer.
  • the fibres of the filter paper layer 3 are arranged closer to one another and thus have a higher separation efficiency than the fibres of the carded fleece layer 2.
  • the filter paper layer 3 arranged on the downstream side is water-resistant (measured by the water absorption capacity according to DIN EN ISO 535, whereby water-resistant in the sense of this application means a water absorption capacity according to Cobb60 of DIN EN ISO 535 of less than 20 g/m 2 at 20 °C and standard pressure) and preferably flame-retardant.
  • the flow direction 8 is in Fig. 1 to 4 represented by arrows
  • the cellulose fibres are preferably laid down wet during the production of the filter paper layer 3.
  • the carded fleece layer 2 can be made up of at least 80 percent by weight (wt.%) of polyester. This type of fiber has proven to be particularly temperature-resistant and is therefore preferred. The remaining 20 wt.% of such types of fiber can be, for example, bi-component fibers with a polyester core and a co-polyester sheath.
  • the fineness of the fibers of the carded fleece layer 2 is between 1 to 30 decitex (decitex), preferably 3 to 15 decitex.
  • the average fiber diameter of the fibers of the carded fleece layer can preferably be greater than 10 ⁇ m.
  • the air permeability of the carded fleece layer 2 is preferably 1600 - 6000 l/(m 2 *s) at a pressure difference of 200 Pa according to EN ISO 9237.
  • the measuring device used must meet the requirements of the above-mentioned standard.
  • the carded nonwoven layer 2 can consist of fibers of a polyester or comprise more than 80 percent by mass of such fibers. In a further preferred variant, at least 10 percent by mass of the fibers of the carded nonwoven layer 2 can consist of bicomponent fibers or so-called core-sheath fibers, which contain portions of a polyester copolymer.
  • the core material can particularly preferably consist of a pure polyester material and the sheath fibers of a polyester copolymer, in particular of a co-polyester with a lower melting temperature than polyester.
  • polypropylene can also be used as a fiber material for the fibers of the carded fleece layer 2.
  • the average fiber length of the fibers of the carded fleece layer 2 can be between, for example, 20 to 100 mm, preferably between 50 and 60 mm.
  • the filter medium is folded into a so-called bellows, which is folded in sections into Fig.2
  • a corresponding filter element with a filter medium designed as a bellows is known, for example, from EN 10 2012 25 019 862 A1 known.
  • the pleat spacing (a) of the folded filter medium 1 is greater than 3.5 mm, particularly preferably between 4 and 8 mm.
  • the pleat height (b) of the folded filter medium 1 is between 10 and 60 mm.
  • the layers of the filter medium can be Fig. 3a to 3c be connected to each other by lamination.
  • the connection between the layers 2 and 3 is made, for example, by an adhesive 5.
  • This can preferably be in the form of an adhesive layer (nonwoven fabric) or an adhesive powder or can be made as an interrupted film by spray application.
  • the connection by means of adhesive is in Fig. 3c shown.
  • thermofusion or thermocalendering i.e. bonding the layers using temperature and/or increased pressure.
  • Fig. 3b Another optional possibility is a local (interrupted) connection of the layers by ultrasonic welding.
  • Fig. 3a in which the filter medium has welding points 4, which are introduced into the filter material, for example, by ultrasonic welding or thermocalendering.
  • welding points 4 which are introduced into the filter material, for example, by ultrasonic welding or thermocalendering.
  • layers 2 and 3 are fed separately to a folding machine.
  • the layers can then preferably be connected by gluing the front edges of the bellows, i.e. a trace of adhesive applied along the front edges that holds the folds together and creates a separation between the raw and clean sides in the area of the fold pockets or the front sides formed by the zigzag-shaped front edges.
  • traces of adhesive or adhesive beads applied before the folding process can ensure that the layers stay together.
  • the filter medium 1 preferably has a maximum of three filter layers, i.e. a further filter layer in addition to the carded fleece layer 2 and the filter paper layer 3.
  • One or two optional adhesive layers that connect the three filter layers to one another can also be provided.
  • the arrangement of a maximum of three filter layers promotes cost-effective production through a process-reliable, stable foldability of the filter medium.
  • the filter paper layer 3 is always a filter layer adjacent to the carded fleece layer 2.
  • the filter paper layer 3 has a gradient with respect to the fiber density and/or the average fiber diameter in the flow direction, which in Fig.1 indicated by an arrow.
  • the downstream side of the filter medium is more dense and consists on average of finer fibers than the upstream side.
  • individual filter layers can be needled, impregnated or thermally bonded.
  • the filter medium 1 according to the invention is preferably used in air filter elements.
  • One application is the filtration of the intake air required for combustion before it is introduced into an internal combustion engine, for example in motor vehicles and motorcycles.
  • FIG.4 The diagram shown illustrates the increase in the dust absorption capacity or dust storage capacity of a filter element consisting of folded filter medium of the filter medium 1 according to the invention in comparison to a conventional paper element (single-layer cellulose paper) whose folds are made only of filter paper. This was compared with an increasing pressure drop. Compared to this comparison medium, the use of a filter medium in accordance with the invention offers a significant improvement in performance.
  • the dust absorption capacity of the filter medium 1 according to the invention is significantly increased compared to the dust capacity of the single-layer cellulose paper with the same degree of separation (see Table 1). By combining the two aforementioned layers, the filtration performance (dust absorption capacity and/or degree of separation) is optimized.
  • the increase in the dust absorption capacity occurs in the course of a continuous addition of dust and the resulting increase in pressure loss of the respective filter element 1 or 10. This is determined according to the method described in ISO 5011 in the version at the time of the first application of the present invention.
  • a test dust according to ISO 12103-A2 in the version at the time of the first application of the present invention was used.
  • the mass flow of the dust-laden test flow was 750 kg/h.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Filtering Materials (AREA)

Claims (11)

  1. Milieu filtrant (1), notamment pour filtrer un milieu gazeux, comprenant une couche de voile de carde (2) à pores ouverts et une couche de papier filtrant (3) disposée du côté aval de celle-ci en tant que couche filtrante voisine, la couche de voile de carde (2) présentant une perméabilité à l'air plus élevée que la couche de papier filtrant (3) et la perméabilité à l'air de la couche de voile de carde (2), mesurée selon DIN EN ISO 9237 à une pression différentielle de 200 Pa, étant supérieure à 800 l/m2/s, notamment comprise entre 1600 et 6000 l/m2/s, et la couche de voile de carde (2) présentant une finesse moyenne des fibres comprise entre 1 et 30 décitex, et le grammage moyen de la couche de voile de carde (2), mesuré selon DIN EN 29073-1, étant compris entre 10 et 120 g/m2.
  2. Milieu filtrant selon la revendication 1, caractérisé en ce que la couche de papier filtrant (3) comprend une couche de fibres cellulosiques déposée par voie humide.
  3. Milieu filtrant selon la revendication 2, caractérisé en ce que la couche de fibres cellulosiques présente jusqu'à 30 pour cent en masse de fibres synthétiques.
  4. Milieu filtrant selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins la couche de papier filtrant (3), de préférence également la couche de voile de carde (2) et plus préférentiellement toutes les couches du milieu filtrant, présentent une imprégnation, notamment pour consolider et lier les fibres de cellulose.
  5. Milieu filtrant selon la revendication 4, caractérisé en ce que l'imprégnation est une imprégnation ignifuge, l'imprégnation présentant notamment un agent ignifuge, de préférence un agent ignifuge à base de phosphore, l'agent ignifuge et sa concentration étant de préférence choisis de sorte que la couche de papier filtrant (3) et/ou la couche de voile de carde (2) et/ou le milieu filtrant (1) présente des propriétés ignifuges selon la classe d'ignifugation F1 selon DIN 53 438 - 3.
  6. Milieu filtrant selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins 80 pour cent en masse des fibres dans la couche de voile de carde (2) contiennent du polyester.
  7. Milieu filtrant selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche de papier filtrant (3) et la couche de voile de carde (2) sont reliées entre elles par laminage des couches, de préférence sous l'effet de la pression et de la température, notamment par calandrage thermique / sous pression.
  8. Milieu filtrant selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche de papier filtrant (3) et la couche de voile de carde (2) sont reliées entre elles, notamment par une couche centrale adhésive.
  9. Elément filtrant ayant un milieu filtrant plié (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la distance entre les plis du milieu filtrant plié (1) est supérieure à 3,5 mm, de préférence 4 à 8 mm, et en ce que la hauteur des plis du milieu filtrant (1) est comprise entre 10 et 60 mm.
  10. Elément filtrant selon la revendication 9, caractérisé en ce que les plis du milieu filtrant présentent des arêtes frontales, la liaison des couches du milieu filtrant (1) étant réalisée par un collage le long des arêtes frontales, notamment par des traces notamment continues d'adhésif, notamment de colle thermofusible.
  11. Utilisation du milieu filtrant (1) selon l'une quelconque des revendications 1 à 8 et/ou d'un élément filtrant selon la revendication 9 ou 10 pour filtrer l'air aspiré avant son introduction dans un moteur à combustion interne.
EP18727764.5A 2017-05-24 2018-05-24 Milieu filtrant, son procédé de fabrication et son utilisation dans un élément filtrant Active EP3630335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017004973.4A DE102017004973A1 (de) 2017-05-24 2017-05-24 Filtermedium, Verfahren zu dessen Herstellung und Verwendung des Filtermediums in einem Filterelement
PCT/EP2018/063590 WO2018215574A1 (fr) 2017-05-24 2018-05-24 Milieu filtrant, son procédé de fabrication et son utilisation dans un élément filtrant

Publications (2)

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EP3630335A1 EP3630335A1 (fr) 2020-04-08
EP3630335B1 true EP3630335B1 (fr) 2024-04-24

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US (1) US20200155985A1 (fr)
EP (1) EP3630335B1 (fr)
CN (1) CN110678245A (fr)
DE (2) DE102017004973A1 (fr)
WO (1) WO2018215574A1 (fr)

Citations (3)

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EP1050331B1 (fr) * 1999-05-06 2003-12-10 FiberMark Gessner GmbH & Co. Milieu filtrant à deux ou plusieurs couches pour filtration de l'air et élément filtrant à partir de celle-ci
US20160129381A1 (en) * 2013-03-15 2016-05-12 Donaldson Company, Inc. Filter media and elements
US20170312673A1 (en) * 2015-09-18 2017-11-02 Hollingsworth & Vose Company Filter media including a waved filtration layer

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JP2006175352A (ja) * 2004-12-22 2006-07-06 Toyota Boshoku Corp フィルタ用濾材
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JP3134943U (ja) * 2007-06-15 2007-08-30 呉羽テック株式会社 、燃料フィルター本考案は主として内燃機関等に設けられた燃料タンクからナノ燃料噴射装置へ燃料を供給する過程で濾過材として用いられる燃料フィルターに関するものである。
JP2009028617A (ja) * 2007-07-26 2009-02-12 Kureha Ltd フィルター不織布
CN102240480A (zh) * 2011-07-11 2011-11-16 邯郸派瑞电器有限公司 一种空气净化用抗菌无纺布滤纸的制备方法
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Publication number Priority date Publication date Assignee Title
EP1050331B1 (fr) * 1999-05-06 2003-12-10 FiberMark Gessner GmbH & Co. Milieu filtrant à deux ou plusieurs couches pour filtration de l'air et élément filtrant à partir de celle-ci
US20160129381A1 (en) * 2013-03-15 2016-05-12 Donaldson Company, Inc. Filter media and elements
US20170312673A1 (en) * 2015-09-18 2017-11-02 Hollingsworth & Vose Company Filter media including a waved filtration layer

Also Published As

Publication number Publication date
DE112018002675A5 (de) 2020-03-05
DE102017004973A1 (de) 2018-11-29
US20200155985A1 (en) 2020-05-21
CN110678245A (zh) 2020-01-10
EP3630335A1 (fr) 2020-04-08
WO2018215574A1 (fr) 2018-11-29

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